mL to µL Converter: Milliliters to Microliters
Convert milliliters to microliters and back, live, with the exact factor, a multi-unit panel (µL, mL, L, cc, drops), show-your-work steps, a quick table, worked examples, and lab reference cards.
Two-way converter
The “drop” unit uses the standard medical dropper (20 drops per mL), so it is approximate. All other conversions are exact.
All units at once
| Unit | Value | Exact? |
|---|
Quick conversion table
| Milliliters (mL) | Microliters (µL) |
|---|---|
| 0.1 | 100 |
| 0.25 | 250 |
| 0.5 | 500 |
| 1 | 1,000 |
| 2.5 | 2,500 |
| 5 | 5,000 |
| 10 | 10,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 100 | 100,000 |
Lab context cards
Micropipette ranges
- P2: 0.2–2 µL
- P20: 2–20 µL
- P200: 20–200 µL
- P1000: 100–1,000 µL
Pick the smallest pipette whose range covers your volume (e.g. a P200 for 50 µL).
Insulin U-100: unit fact
- 100 units per 1 mL
- 1 unit = 10 µL
- 10 units = 100 µL = 0.1 mL
A unit-conversion fact, not dosing advice.
Drops: approximate
- 20 drops ≈ 1 mL (medical dropper)
- 1 drop ≈ 50 µL
- Real drop size varies
Never use drops for precise lab work.
Worked examples
Scope boundary
This tool: milliliter ↔ microliter (plus L, cc and drops on the same volume scale). Not this tool: liter ↔ cubic centimeter conversions live on our liter-cc converter, and micron-based length tools (e.g. micron-to-mil-conversion) belong to a different unit family (length, not volume).
Frequently asked questions
How many microliters are in one milliliter?
Exactly 1,000 µL. One milliliter equals 1,000 microliters: “milli” means one-thousandth and “micro” means one-millionth, so a milliliter is a thousand times larger than a microliter.
How many milliliters are in one microliter?
0.001 mL. Divide microliters by 1,000 to get milliliters: 1 µL ÷ 1,000 = 0.001 mL.
What is 2.5 mL in microliters?
2,500 µL. Multiply milliliters by 1,000: 2.5 mL × 1,000 = 2,500 µL.
What is 100 µL in milliliters?
0.1 mL. Divide microliters by 1,000: 100 µL ÷ 1,000 = 0.1 mL.
How many microliters are in a liter?
1,000,000 µL. A liter is 1,000 mL and each milliliter is 1,000 µL, so 1 L = 1,000 × 1,000 = 1,000,000 µL.
Is 1 cc the same as 1 mL?
Yes. 1 cc (cubic centimeter) is exactly equal to 1 mL, which equals 1,000 µL. They are two names for the same volume.
How many microliters are in a drop?
About 50 µL. A standard medical dropper delivers 20 drops per milliliter, so 1 drop ≈ 1 mL ÷ 20 = 50 µL. This is approximate: real drop size varies with the liquid and the dropper.
What is 0.5 mL in microliters?
500 µL. Multiply by 1,000: 0.5 mL × 1,000 = 500 µL.
What is 250 µL in milliliters?
0.25 mL. Divide by 1,000: 250 µL ÷ 1,000 = 0.25 mL.
How many microliters is one unit of U-100 insulin?
10 µL. U-100 insulin contains 100 units per 1 mL, so 1 unit = 1 mL ÷ 100 = 0.01 mL = 10 µL. This is a unit-conversion fact, not medical advice; always follow your prescriber’s dosing instructions.
Which micropipette should I use for 50 µL?
A P200 (20–200 µL range). Common lab micropipette ranges are P2 (0.2–2 µL), P20 (2–20 µL), P200 (20–200 µL), and P1000 (100–1,000 µL); pick the smallest pipette whose range covers your volume.
What is 10 mL in microliters?
10,000 µL. Multiply by 1,000: 10 mL × 1,000 = 10,000 µL.
What is the difference between µL and ul?
None in meaning. µL is the correct symbol for microliter; “ul” is the common ASCII fallback used when the µ character is unavailable. Both mean one-millionth of a liter.
Why is the conversion factor 1,000?
Because of the metric prefixes: milli = 10^-3 and micro = 10^-6. Their ratio is 10^-3 ÷ 10^-6 = 1,000, so 1 mL = 1,000 µL exactly, by definition.
Should I use this tool or the liter-cc converter?
Use this tool for milliliter ↔ microliter conversions. For liter ↔ cubic centimeter conversions, use our liter-cc converter: it covers the liter scale, while this page covers the milliliter scale. Note 1 cc = 1 mL = 1,000 µL.
How many drops are in 2.5 mL?
About 50 drops. At the standard medical rate of 20 drops per mL: 2.5 mL × 20 = 50 drops. This is approximate; actual drop size varies.
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